Solutions by everydaycalculation.com

12 - 17 is 514.

- Find the least common denominator or LCM of the two denominators:

LCM of 2 and 7 is**14**

Next, find the equivalent fraction of both fractional numbers with denominator 14 - For the 1st fraction, since 2 × 7 = 14,

12 = 1 × 72 × 7 = 714 - Likewise, for the 2nd fraction, since 7 × 2 = 14,

17 = 1 × 27 × 2 = 214 - Subtract the two like fractions:

714 - 214 = 7 - 214 = 514

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